腕关节镜结合Fragment specific fixation技术在桡骨远端C型骨折中的应用

[目的]探讨腕关节镜结合Fragment specific fixation技术在桡骨远端C型骨折中的治疗效果。[方法]采用腕关节镜Fragment specific fixation技术辅助克氏针、钢板内固定或外固定支架[1]治疗桡骨远端C型骨折12例,平均随访11.3个月,临床疗效根据Sarmiento改良的Gartland-Werley计分法行腕关节功能计分和询问患者主观感觉。[结果]术后X线检查显示骨折愈合良好,无延迟愈合或不愈合。桡骨远端的掌倾角、尺偏角和桡骨高度均恢复正常。用疼痛标尺行疼痛计分评价,结果:疼痛不明显者9例,轻度疼痛者2例,中度疼痛者1例,平均疼痛计分(0.92±0.61)分;腕关节功能评定:优8例,良2例,一般2例,优良率83.3%,平均评分(3.08±1.21)分。[结论]采用腕关节镜结合Fragment specific fixation技术治疗桡骨远端C型骨折,既可较好地解决维持桡骨关节面高度和恢复关节面平整的问题,最大程度地恢复关节功能,减轻创伤性关节炎,又可以了解腕关节内韧带和TFCC等结构的损伤程度,骨折处固定更加合理、牢固,患者创伤小、恢复快、功能好。

采用提篮钢板技术治疗粉碎性髌骨下极骨折的疗效分析

目的探讨应用提篮钢板技术治疗粉碎性髌骨下极骨折的临床疗效。方法回顾性分析唐山市第二医院创伤一科2021年3月至2024年3月应用提篮钢板技术治疗的18例粉碎性髌骨下极骨折患者的临床资料,其中男10例,女8例,年龄21~73(44.1±14.2)岁;左膝7例,右膝11例;交通伤8例,摔伤10例。应用提篮钢板技术治疗粉碎性髌骨下极骨折。住院期间观察记录患者年龄、性别、术前疼痛评分(FPS-R)。患者出院后于术后6周、8周、10周、12周、6个月、12个月门诊复查随访,记录骨折愈合时间、膝关节屈曲康复时间、末次随访FPS-R,末次随访B?stman髌骨骨折疗效评分。结果18例患者术前FPS-R评分6(4,6)分,切口均一期愈合,无失访患者;随访时间6~12个月;骨折愈合时间8(6,8.5)周;膝关节屈曲康复时间:90°需3(3,4)周,120°需6(6,8)周,全范围需10(8,10)周;末次随访FPS-R评分2(0,2)分;末次随访B?stman髌骨骨折疗效评分29(28,30)分,优17例,良1例,优良率为100%。18例患者骨折愈合良好,未出现感染、切口愈合不良、内固定物失效、内固定激惹等并发症。结论应用提篮钢板技术治疗粉碎性髌骨下极骨折疗效确切、满意。该技术可达到骨折坚强内固定、早期功能锻炼的目的,术后并发症少,骨折愈合率高,膝关节功能恢复好,疗效优良率高。该技术内固定材料获取容易,手术技术简单,适合在基层医院推广应用。

Microfluidic-oriented synthesis of enriched iridium nanodots/carbon architecture for robust electrocatalytic nitrogen fixation

Electrocatalytic nitrogen reduction reaction(NRR)is considered as a promising candidate to achieve ammonia synthesis because of clean electric energy,moderate reaction condition,safe operating process and harmless by-products.However,the chemical inertness of nitrogen and poor activated capacity on catalyst surface usually produce low ammonia yield and faradic efficiency.Herein,the microfluidic technology is proposed to efficiently fabricate enriched iridium nanodots/carbon architecture.Owing to in-situ co-precipitation reaction and microfluidic manipulation,the iridium nanodots/carbon nanomaterials possess small average size,uniform dispersion,high conductivity and abundant active sites,producing good proton activation and rapid electrons transmission and moderate adsorption/desorption capacity.As a result,the as-prepared iridium nanodots/carbon nanomaterials realize large ammonia yield of 28.73 μg h^(-1) cm^(-2) and faradic efficiency of 9.14%in KOH solution.Moreover,the high ammonia yield of 11.21 μg h^(-1) cm^(-2) and faradic efficiency of 24.30%are also achieved in H_(2)SO_(4) solution.The microfluidic method provides a reference for large-scale fabrication of nano-sized catalyst materials,which may accelerate the progress of electrocatalytic NRR in industrialization field.

In vitro performance of a biodegradable zinc alloy adjustable-loop cortical suspension fixation for anterior cruciate ligament reconstruction

Anterior cruciate ligament(ACL)injuries of the knee are one of the most common and serious athletic injuries.The widely used cortical suspension fixation buttons for ligament reconstruction are permanent implants,particularly those made from conventional steel or titanium alloys.In this study,a biodegradable Zn-0.45Mn-0.2Mg(ZMM42)alloy with the yield strength of 300.4 MPa and tensile strength of 329.8 MPa was prepared through hot extrusion.The use of zinc alloys in the preparation of cortical suspension fixation buttons was proposed for the first time.After 35 d of immersion in simulated body fluids,the ZMM42 alloy fixation buttons were degraded at a rate of 44μm/a,and the fixation strength was retained(379.55 N)in the traction loops.Simultaneously,the ZMM42 alloy fixation buttons exhibited an increase in MC3T3-E1 cell viability and high antibacterial activity against Escherichia coli and Staphylococcus aureus.These results reveal the potential of biodegradable zinc alloys for use as ligament reconstruction materials and for developing diverse zinc alloy cortical suspension fixation devices.

Increased dependence on nitrogen-fixation of a native legume in competition with an invasive plant

Suppression of roots and/or their symbiotic microorganisms,such as mycorrhizal fungi and rhizobia,is an effective way for alien plants to outcompete native plants.However,little is known about how invasive and native plants interact with the quantity and activity of nutrient-acquisition agents.Here a pot experiment was conducted with monoculture and mixed plantings of an invasive plant,Xanthium strumarium,and a common native legume,Glycine max.We measured traits related to root and nodule quantity and activity and mycorrhizal colonization.Compared to the monoculture,fine root quantity(biomass,surface area)and activity(root nitrogen(N)concentration,acid phosphatase activity)of G.max decreased in mixed plantings;nodule quantity(biomass)decreased by 45%,while nodule activity in Nfixing via rhizobium increased by 106%;mycorrhizal colonization was unaffected.Contribution of N fixation to leaf N content in G.max increased in the mixed plantings,and this increase was attributed to a decrease in the rhizosphere soil N of G.max in the mixed plantings.Increased root quantity and activity,along with a higher mycorrhizal association was observed in X.strumarium in the mixed compared to monoculture.Together,the invasive plant did not directly scavenge N from nodule-fixed N,but rather depleted the rhizosphere soil N of the legume,thereby stimulating the activity of N-fixation and increasing the dependence of the native legume on this N source.The quantity-activity framework holds promise for future studies on how native legumes respond to alien plant invasions.

竞争对手技术相似性与技术能力的企业技术机会识别

在激烈的市场竞争中,企业如何实现高水平科技自立自强至关重要,在竞争对手视角下进行技术机会识别有助于企业实现创新突破,提升核心竞争力。构建技术相似性和技术能力二维矩阵选择竞争对手,在竞争对手视角下使用关联规则挖掘算法识别技术机会,最后利用对手关注度对技术机会进行评估,获取对手关注度较低的技术机会。通过对比实验,证明在技术相似性与技术能力的基础上进行竞争对手选择能够提升识别机会的准确率。使用自然语言处理领域专利数据,以腾讯科技有限公司为例,识别出数据处理和计算模型、信息和通信技术应用、图像和视频处理与识别三个方向的技术机会,为企业的研发创新提供了参考依据。

面向应用场景的前沿技术识别方法

[研究目的]场景驱动创新是引领产业结构升级的关键路径,如何基于不同场景识别前沿技术成为推动新质生产力发展的重要议题。[研究方法]提出了一种面向应用场景的前沿技术识别方法。首先以专利、论文为数据源,基于前瞻性、先导性、探索性、颠覆性指标体系初步筛选前沿技术主题;其次以科技报告为数据源,基于技术-关系-技术(Technology-Relationship-Technology,TRT)结构的语义分析,分析技术应用场景;最后,构建专利、论文数据与科技报告的相似性矩阵,建立技术与场景识别结果的关联,据此进一步筛选前沿技术主题,并结合专家知识,识别出面向应用场景的前沿技术主题,提供了场景驱动实践探索的新方法。[研究结果/结论]以无人机目标识别与跟踪领域为例进行实证研究,在面向情报、监视与侦察(Intelligence,Surveillance,and Reconnaissance,ISR)、物资运输、医疗补给等14个应用场景的前沿技术识别结果显示,目标识别与跟踪算法设计、视觉系统与图像处理技术、任务规划技术、无线通信技术4项技术为该领域的前沿技术,验证了该识别方法的可行性与有效性。

超声辅助闭合复位技术在儿童O'Brien Ⅱ、Ⅲ型桡骨颈骨折治疗中的临床应用

目的 介绍一种超声辅助闭合复位技术并探讨其在治疗儿童桡骨颈骨折中的疗效。方法 回顾性分析2020年8月—2022年8月昆明市儿童医院急诊创伤外科收治的30例O'BrienⅡ、Ⅲ型儿童桡骨颈骨折资料,男性19例,女性11例;年龄4~12岁,平均8.6岁;左侧13例,右侧17例;致伤原因均为跌倒;根据O'Brien分型,Ⅱ型12例、Ⅲ型18例。30例均采用术中超声定位下辅助闭合复位和弹性髓内针固定治疗。统计人口学资料和临床资料,包括年龄、性别、手术时间、骨折愈合时间和并发症。根据Metaizeau评价标准评价复位效果和并发症情况评价手术疗效。结果 30例均成功行超声辅助闭合复位,平均手术时间(31.0±4.6)min,骨折愈合时间(5.0±1.0)周,Metaizeau评价28例为优,2例为良;无一例出现桡骨头坏死、神经损伤、骨骺早闭;1例出现针尾激惹,取出内固定后门诊随访愈合良好。结论 超声作为一种无辐射、可重复的无创技术,可辅助复位儿童桡骨颈骨折,疗效满意,并且兼具微创、操作方便等优点。

Sustainable nitrogen fixation by bubble discharge plasma:Performance optimization and mechanism

Sustainable nitrogen fixation driven by renewable energy sources under mild conditions has been widely sought to replace the industrial Haber-Bosch process.The fixation of nitrogen in the form of NO_(x)^(-)and NH_4^(+)into aqueous solutions using electricity-driven gas-liquid discharge plasma is considered a promising prescription.In this paper,a scalable bubble discharge excited by nanosecond pulse power is employed for nitrogen fixation in the liquid phase.The nitrogen fixation performance and the mechanisms are analyzed by varying the power supply parameters,working gas flow rate and composition.The results show that an increase in voltage and frequency can result in an enhanced NO_(3)^(-)yield.Increases in the gas flow rate can result in inadequate activation of the working gas,which together with more inefficient mass transfer efficiencies can reduce the yield.The addition of O_(2) effectively elevates NO_(3)^(-)production while simultaneously inhibiting NH_4^(+) production.The addition of H_(2)O vapor increases the production of OH and H,thereby promoting the generation of reactive nitrogen and enhancing the yield of nitrogen fixation.However,the excessive addition of O_(2) and H_(2)O vapor results in negative effect on the yield of nitrogen fixation,due to the significant weakening of the discharge intensity.The optimal nitrogen fixation yield was up to 16.5 μmol/min,while the optimal energy consumption was approximately 21.3 MJ/mol in this study.Finally,the mechanism related to nitrogen fixation is discussed through the optical emission spectral(OES) information in conjunction with the simulation of energy loss paths in the plasma by BOLSIG+.The work advances knowledge of the effect of parameter variations on nitrogen fixation by gas-liquid discharge for higher yield and energy production.

Intermittent sliding-lock-knot suture for limbal conjunctival autograft fixation in pterygium surgery:a technique note

AIM:To report a technique used with intermittent slidinglock-knot(ISLK)fixation for limbal conjunctival autografts in pterygium surgery and compared with those of routine intermittent(RI)fixation.METHODS:Consecutive patients with primary pterygium who had undergone pterygium excision combined with limbal conjunctival autograft transplantation between March 2021 and March 2022 at our institute were retrospectively analyzed.Primary outcome measures were mean duration of surgery and suture removal,degree of conjunctival hyperemia on postoperative day 1,pain score at suture removal,postoperative symptoms at 6mo,including conjunctival hyperemia,foreign body sensation,and graft stability.RESULTS:Ninety-eight patients underwent monocular surgery and were divided into ISLK(51 eyes)and RI(47 eyes)groups according to the type of conjunctiva autograft fixation method planned.There was no significant difference in mean duration of surgery between the two groups(18.59±2.39min vs 18.15±2.20min,P=0.417);however,compared to the RI group,shorter suture removal times were observed in the ISLK group[0.58min(0.42-0.87)vs 3.00min(2.21-4.15),P<0.001].The degree of conjunctival hyperemia on postoperative day 1 was milder in the ISLK group(P<0.001).Pain scores at suture removal were lower in the ISLK group than in RI group[1(0-3)vs 2(1-4),P<0.001].Postoperative symptoms at 6mo were comparable between the groups(P=0.487),with no recurrence.CONCLUSION:ISLK is an innovative method for limbal conjunctival autograft fixation after pterygium excision.Compared to RI fixation,ISLK facilitates suture removal and reduces discomfort,with comparable surgery duration and less conjunctival hyperemia.

Plasma nitrogen fixation system with dual-loop enhancement for improved energy efficiency and its efficacy for lettuce cultivation

Plasma nitrogen fixation(PNF)has been emerging as a promising technology for greenhouse gasfree and renewable energy-based agriculture.Yet,most PNF studies seldom address practical application-specific issues.In this work,we present the development of a compact and automatic PNF system for on-site agricultural applications.The system utilized a gliding-arc discharge as the plasma source and employed a dual-loop design to generate NO_(x)from air and water under atmospheric conditions.Experimental results showed that the system with a dualloop design performs well in terms of energy costs and production rates.Optimal operational parameters for the system were determined through experimentation,resulting in an energy cost of 13.9 MJ mol^(-1)and an energy efficiency of 16 g kWh^(-1)for NO_(3)^(-)production,respectively.Moreover,the concentration of exhausted NO_(x)was below the emission standards.Soilless lettuce cultivation experiments demonstrated that NO_(x)^(-)produced by the PNF system could serve as liquid nitrate nitrogen fertilizer.Overall,our work demonstrates the potential of the developed PNF system for on-site application in the production of green-leaf vegetables.

Sutured scleral fixation of existing subluxated/dislocated acrylic one-piece intraocular lenses

AIM:To evaluate the visual and refractive outcomes in cases after sutured scleral fixation of existing subluxated or dislocated acrylic one-piece intraocular lenses(IOLs).METHODS:This study retrospectively enrolled a consecutive series of patients who underwent a surgery of sutured existing subluxated or dislocated IOLs from October 2018 to June 2020.All patients underwent comprehensive preoperative and postoperative ophthalmologic examination,and data were collected including age,sex,surgical indications,best-corrected visual acuity,refractive error,intraocular pressure.Presence of intraoperative and postoperative surgical complications was documented.RESULTS:A total of 20 consecutive cases were enrolled for analysis with mean final follow-up period 9.8±5.3mo.Visual acuity improved from a mean of 0.35(0.46±0.32 logMAR)preoperatively to 0.61(0.21±0.18 logMAR)at the 3-month follow-up(P=0.002).The mean amount of preoperative keratometric astigmatism and total postoperative refractive astigmatism was-1.24±0.80 diopters(D)and-1.42±0.97 D,respectively.There was no statistically significant difference between preoperative and postoperative astigmatism(P=0.156).The mean IOL-induced astigmatism was-0.23±0.53 D.The mean spherical equivalent at the 3-month follow-up was-0.1±0.94 D.No major complications were noted during the follow-up period.CONCLUSION:Surgical techniques using sutured scleral fixation of existing subluxated or dislocated acrylic one-piece IOLs result in favorable visual and refractive outcomes without major complications.

Health economics for intra-capsular hip fractures undertaking fixation

BACKGROUND Hip fracture is a common musculoskeletal injury in the elderly requiring surgery worldwide.The operative mainstay of intra-capsular hip fractures is arthroplasty with a smaller proportion for fixation.AIM To determine the most beneficial method of fixation for patients with intracapsular hip fractures.METHODS A registered audit from 2012-2018 was conducted on all intra-capsular hip fractures treated with 2 commonly used fixation methods.Patient notes,electronic records and clinical codes for cost benefit were evaluated.A validated quality of life measure was collected at least 1 year after surgery.RESULTS A total of 83 patients were identified with intra-capsular fractures undergoing fixation during the retrospective period.There were 47 cannulated cancellous screw and 36 sliding hip screw fixations with the case mix comparable for age,gender,co-morbidities and fracture configuration.There was no significant difference in blood loss,tip apex distance,radiation exposure,length of stay,radiological union time,collapse,avascular necrosis or re-operation between fixation methods.Logistic regression analysis demonstrated displaced intracapsular hip fractures correlated significantly with an undesirable outcome conferring a relative odds ratio of 7.25.There were 9(19%)and 4(11%)patients respectively,who required re-operation.There was no significant difference in health resource group tariff and implant cost with comparable EQ-5D and visual CONCLUSION No significant advantage was identified with differing fixation type,but irrespective there were a high number of patients requiring re-operation.This was predicted by initial fracture displacement and patient age.Arthroplasty may need to be carefully considered for health economics and patient benefit.

Transcapsular scleral fixation of the standard capsular tension ring and in-the-bag intraocular lens implantation for severely subluxated lenses

AIM:To present a technique of transcapsular scleral fixation of the standard capsular tension ring(CTR)through equatorial capsulotomy and in-the-bag intraocular lens(IOL)implantation in subluxated lenses.METHODS:This retrospective consecutive case series included patients with subluxated lenses by more than 180 degrees who underwent lens extraction,transcapsular scleral fixation of the standard CTR through equatorial capsulotomy,in-the-bag IOL implantation and with at least 6mo follow-up.Preoperative and postoperative best corrected visual acuity(BCVA),intraocular pressure(IOP),complications,and postoperative IOL tilt and decentration were recorded.RESULTS:Nine eyes of 7 patients with a mean followup of 11.0±3.7mo were included in this study.The BCVA was significantly improved from 0.64±0.22 logMAR preoperatively to 0.21±0.19 logMAR postoperatively(P<0.001).The IOP was within the normal range postoperatively.The mean tilt of the IOL was 4.30°±2.31°(range,1.0°to 8.9°)and the mean decentration of the IOL was 0.37±0.12 mm(range,0.14 to 0.50 mm).No visually threatened intraoperative and postoperative complications were detected during the follow-up period.CONCLUSION:This is a safe and effective surgical technique for managing patients with severely subluxated lenses.It has achieved favorable outcomes with fewer surgical manipulations and less need for advanced capsular support devices.

Arthroscopic M-shaped suture fixation for tibia avulsion fracture of posterior cruciate ligament:A modified technique and case series

BACKGROUND Tibial avulsion fractures of the posterior cruciate ligament(PCL)are challenging to treat and compromise knee stability and function.Traditional open surgery often requires extensive soft tissue dissection,which may increase the risk of morbidity.In response to these concerns,arthroscopic techniques have been evolving.The aim of this study was to introduce a modified arthroscopic tech-nique utilizing an M-shaped suture fixation method for the treatment of tibial avulsion fractures of the PCL and to evaluate its outcomes through a case series.AIM To evaluate the effects of arthroscopic M-shaped suture fixation on treating tibia avulsion fractures of the PCL.METHODS We developed a modified arthroscopic M-shaped suture fixation technique for tibia avulsion fractures of the PCL.This case series included 18 patients who underwent the procedure between January 2021 and December 2022.The patients were assessed for range of motion(ROM),Lysholm score and International knee documentation committee(IKDC)score.Postoperative complications were also recorded.RESULTS The patients were followed for a mean of 13.83±2.33 months.All patients showed radiographic union.At the final follow-up,all patients had full ROM and a negative posterior drawer test.The mean Lysholm score significantly improved from 45.28±8.92 preoperatively to 91.83±4.18 at the final follow-up(P<0.001),and the mean IKDC score improved from 41.98±6.06 preoperatively to 90.89±5.32 at the final follow-up(P<0.001).CONCLUSION The modified arthroscopic M-shaped suture fixation technique is a reliable and effective treatment for tibia avulsion fractures of the PCL,with excellent fracture healing and functional recovery.

A new abdominal drainage tube fixation method for 3-port laparoscopic cholecystectomy improves patients’postoperative quality of life

Objective Laparoscopic surgery has become a routine general surgery with many advantages,such as alleviating abdominal pain.However,postoperative pain caused by abdominal drainage tubes has attracted little attention from medical staff.The aim of this study was to explore the influence of a new abdominal drainage tube fixation method for 3-port laparoscopic cholecystectomy(LC)on patients’postoperative quality of life.Methods Patients who underwent 3-port LC with abdominal drainage tubes in the Department of Hepatobiliary Surgery of Linyi People’s Hospital from March 1,2023 to October 31,2023 due to gallstones with chronic cholecystitis were selected for this study.The patients were randomly divided into an experimental group and a control group.In the experimental group,the new abdominal drainage tube fixation method was used,while in the control group,the traditional method was used.Afterward,the quality of life of patient in terms of pain,activity,recovery time,and mental health status was evaluated.The exudate around the patient’s drainage tube was collected for bacterial culture and analysis.Results A total of 139 patients were randomly divided into an experimental group(70 patients)and a control group(69 patients).The patients’baseline characteristics were not significantly different.The patients in the experimental group had better outcomes in quality of life,with higher pain scores(24.03±2.37 vs.15.48±2.29,p<0.001)and activity scores(20.57±1.78 vs.14.13±1.43,p<0.001),and a shorter postoperative recovery time(2.36±0.68 d vs.2.96±1.34 d,p<0.001).The same results were shown in linear regression analysis scores of the 2 groups.The positive rate of bacterial culture in the exudate around the patient’s drainage tube in the experimental group was significantly lower than that in the control group(12.9%vs.43.5%,p<0.001);and furthermore,the positive rate of conditional pathogenic bacteria was even lower(7.1%vs.33.3%,p<0.001)in the experimental group than in the control group.Conclusion This new abdominal drainage tube fixation method can effectively promote patient rehabilitation and improve the quality of life for patient following 3-port LC with abdominal drainage tubes.

苹果提质增效集成技术

结合多年科学调研与生产实践,构建了优化品种结构、矮密简约化栽培、化肥减施增效、绿色病虫害防控四大技术模块协同的豫西产区苹果提质增效集成技术体系,从而达到减施化肥、减喷农药、减用人工,提高果品质量、提高果业经济效益、提高果园生态效益、提高果农收入的目的。

知识产权强国战略下的图书馆技术与创新支持中心建设

在知识产权强国战略背景下,图书馆技术与创新支持中心(TISC)建设面临机遇与挑战。文章以我国承担或参与建设TISC的图书馆为研究对象,从地域分布、图书馆类型、建设主体、资源建设、服务类别等方面分析TISC建设现状和问题,从区域图书馆知识产权公共服务能力提升、数据资源与智慧化平台建设、知识产权全链条服务、创新团队培育等四个维度提出发展对策。

汽油发动机稀薄燃烧技术特性分析与应用

发动机节能技术一直是汽车制造厂商和科研工作者研究的重点,其中发动机稀薄燃烧节能技术最具有代表性。利用文献分析法综述了汽油发动机稀薄燃烧技术的机理、技术实现途径及应用情况,发现发动机稀燃技术具有明显的节能效果,可为相关领域科研工作者提供理论参考。

现代信息技术在体育舞蹈技术训练中的运用分析

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